You think probable to copper.
Copper
Nitrate
calcium
Copper
AL+S is "soluble"
yes, it is completely soluble in water
Chromates of Alkali metals are soluble, but most other chromates are insoluble
KPO4 should be soluble, as most salts containing K are.
Nitrates are ionic compounds soluble in water.
Because the soluble salts are dissociated in water solutions forming ions.
Silver nitrate is the most soluble in water of all common silver salts and is generally considered soluble, although it does have a saturation limit.
Most probably potassium acetate is meant, which is soluble like (almost) all potassium salts.
Copper salts generally absorbs the light of a wavelength of 580-630 nm..By looking at the colour you will see that directly opposite the colour orange is the blue green...that's why most of the copper salts have blue colour
Why should it be INsoluble? Contrarily, it is soluble as ALL common potassium salts are! And even more so, most perchlorates are soluble as well!
Some chlorides are soluble (NaCl), some chlorides are insoluble (AgCl) in water.
Yes. Simple alkali metal salts tend to be soluble with extremely few exceptions; most halides are likewise soluble. An alkali metal halide, such as sodium iodide, should be expected to be extremely soluble in water.